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Proceedings Paper

Teleseisms monitoring using chirped-pulse φOTDR
Author(s): María R. Fernández-Ruiz; Ethan L. Williams; Regina Magalhaes; Roel Vanthillo; Luís Costa; Zhongwen Zhan; Sonia Martin-Lopez; Miguel Gonzalez-Herraez; Hugo F. Martins
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Paper Abstract

Monitoring of seismic activity around the word is a topic of high interest for the analysis and understanding of deep Earth dynamics. However, the deployment of a homogeneous network of seismic stations both onshore and offshore poses a strong economic challenge that makes this solution practically inviable. Using the pre-existing fiber optical network for seismic monitoring arises as an excellent solution with important advantages in terms of ubiquity and cost. In this communication, we present the detection of an M8.2 earthquake occurred in Fiji Island using distributed acoustic sensing based on chirped-pulse φOTDR. Two sensors were placed simultaneously at two different locations at >9,000 km from the earthquake epicenter: a metropolitan area and a submarine environment. The recorded data is postprocessed using a 2D linear filter to cancel out environmental noise. The resulting signals are compared with the signals acquired by nearby seismometers. The attained good matching between the recorded data and the seismometer data shows the strong potential of the use of the already-deployed communication fiber network for teleseism monitoring.

Paper Details

Date Published: 28 August 2019
PDF: 4 pages
Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 1119921 (28 August 2019); doi: 10.1117/12.2539966
Show Author Affiliations
María R. Fernández-Ruiz, Univ. de Alcalá (Spain)
Ethan L. Williams, California Institute of Technology (United States)
Regina Magalhaes, Univ. de Alcalá (Spain)
Roel Vanthillo, Marlinks (Belgium)
Luís Costa, Univ. de Alcalá (Spain)
Zhongwen Zhan, California Institute of Technology (United States)
Sonia Martin-Lopez, Univ. de Alcalá (Spain)
Miguel Gonzalez-Herraez, Univ. de Alcalá (Spain)
Hugo F. Martins, Instituto de Óptica, Consejo Superior de Investigaciones Científicas (Spain)


Published in SPIE Proceedings Vol. 11199:
Seventh European Workshop on Optical Fibre Sensors
Kyriacos Kalli; Sinead O. O'Keeffe; Gilberto Brambilla, Editor(s)

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